rules_uv and cc toolchain

[TimotheusBachinger]

Hey all,

I want to use create_venv to built a virtual environment which includes python-ldap.
python-ldap does not ship wheels, bindings must be compiled from source during installation (see https://www.python-ldap.org/en/python-ldap-3.4.3/installing.html).

With rules_uv, building a venv would fallback to searching for clang and fail during bazel run:

bazel run //:create_venv
....
creating build/temp.linux-x86_64-cpython-312/Modules
clang -pthread -fno-strict-overflow -Wsign-compare -Wunreachable-code -DNDEBUG -g -O3 -Wall -fPIC -fPIC -DHAVE_SASL -DHAVE_TLS -DLDAPMODULE_VERSION=3.4.3 "-DLDAPMODULE_AUTHOR=python-ldap project" "-DLDAPMODULE_LICENSE=Python style" -IModules -I/home/timotheus/.cache/uv/builds-v0/.tmpI2PFRO/include -I/home/timotheus/.cache/bazel/_bazel_timotheus/8eab503e08f341c0f5040098b6ae80b5/external/rules_python~~python~python_3_12_3_x86_64-unknown-linux-gnu/include/python3.12 -c Modules/LDAPObject.c -o build/temp.linux-x86_64-cpython-312/Modules/LDAPObject.o

[stderr]
/home/timotheus/.cache/uv/builds-v0/.tmpI2PFRO/lib/python3.12/site-packages/setuptools/_distutils/dist.py:261: UserWarning: Unknown distribution option: 'test_suite'
  warnings.warn(msg)
no previously-included directories found matching 'Doc/.build'
error: command 'clang' failed: No such file or directory

In our project, we already have a cc toolchain registered via rules_cc.
Is it possible to tell rules_uv to use that toolchain instead of searching for clang?

Regards
Timi